Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38b5932557a667c…

MALICIOUS

PDF

107.0 KB Created: 2021-09-02 12:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25f1db349a1dc0e708e710bf1e79774c SHA-1: 85ae0f8c5ef6718cdba38e97f1bd0545b2cf064d SHA-256: b38b5932557a667cc11730fb7d90e9a12327633deede4bfc44e492c215fee218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URL analysis reveal a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/23185dab30868f92e2c951317223019c/gorozufe.pdf In PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/36440619619.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/wabexalilimoza.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/35906479573.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1068cec239---12169791602.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/tefij.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc18c2804a---20934481708.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/f8fc0otsimghuke7upbirvsq3a/34690441876.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d520e5138---16002451464.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/jamirokejexepopezewixevir.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/32516662610.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/63777140592.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1dd6d292929d59c78467c86dcc5dd0c5/68150107308.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/53d5dfa88e4a523041e49ceb00e72153/17704884716.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/91804597699.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/48791479454.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/80315479495.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/peganevapazepikotoxaj.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/4007ae604fb6b68f15f237a213e8999d.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/a47b7o41nch0k4s6p0hj3i9es2/betorotukelimomax.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/getadabasitiwad.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35631c7e90---ranudijapaluwedarututak.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161202c2fd6b1d---lorigike.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b524693091---jipikutavez.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/d81rb38j2feqj7l0ba62n9og6b/53606524435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=leptospirose+veterinaria+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F7 20476 bytes
SHA-256: 06d7d1d9a398375d28d40cfe4a1ba0c4ff1508eb469678a0190dec72445e6cd2
font_01_sfnt_off00016e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001862a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1862A 10468 bytes
SHA-256: d95b544ac3e9f618523818b222f343cd5929acec5321e445ec99392bbdb6514d